hand wound pri at 30 turns per layer, which leaves air between turns which is how they get the hi end response,

since you have cross-overs and lack of insl between the pri-sec, then reliability is not as good as with no cross-overs and some hi voltage insl between pri and sec as one side of sec usuall gets grounded at the speaker jack,

notice the lead breakout,the pri runs underneath the heavy sec, not the best way to wire,it is better to drill holes in the bobbin or use a bobbin with slots,

this method runs the thin pri wire by the heavy speaker winding,and this unit was wired out of phase just like the Vibro Champ output i took apart from the same company,

brn goes to the top 6V6, there is a 2.2 k feedback from the sec,

so this will feed back if wired normally, maybe i should give Antique a ring?

so things we can improve on:

dcr is 300 ohms, the KT88 output i just made is much bigger but has a pri dcr of 60 ohms,lower dcr and you lower distortion,

insulation is bare minimal, we can use nomex in between pri/sec/pri,

use a 1 inch stack-this means less turns for the same henries, less turns means lower dcr, and we have room for bigger wire which means even lower dcr, however, our MTL(mean turn length) will go up 20 percent.

lay the wire flat, this will make the xfmr more reliable which means no costly court battles, and we can use bigger wire again, since the turns per inch will go up.leakage C might go up due to closer wires, but we are using less turns so it should cancel this out.

use 7 sections, 4P and 3S, for better balance and less leakage,

hook up the black lead to the finish, not the start!

use some Ni lams to add perm and thus henries at the expense of a more saturated sound, oh darn,

Route 66, that looks like a cool amp, Vox front end with the pentode, but 6V6 instead of EL84,

plate load for 6V6 and 6BQ5 are both at 8000 for push pull, so the same output could be used for both,

notice in the tube catalogs that distortion for a class A single tube is about 10 percent, and for push pull it drops to 3-4 percent due to cancelled harmonics in the xfmrRCA manal has the distortion specs,

good to see the Marshall pig mp with 6550's ,this DIY 6550 output xfmr has the taps so that should be fun,

let me test this proto-type out in the amp, if it rocks we can make a few more i am sure,

i stuck 11 Ni lams in the middle of the stack, each Ni lam is the equivalent of 10 regular silicon grain lams, so we have about 45 regular lams and 11 Ni = 110 steel lams,so we have 150 lams worth of inductance for levels below 5 k gauss,the Ni will saturate above 6 kg but then the regular core takes over,

so we have the regular core stack for hi flux situations (amp on 11) and we have low volume inductance with the Ni lams,

this thing runs flat from 5 hz to 80 k hz, then starts a steady rise to 275 k hz as leackage C takes over, then a second minor bump at 675 k hz, the other xfmr simply rolls off after 80 k, so we might have a different sound on the high end,